Update indexmap to version 2 (#439)

Author: fornwall

metrics-exporter-prometheus/Cargo.toml

@@ -27,7 +27,7 @@ metrics = { version = "^0.22", path = "../metrics" }
 metrics-util = { version = "^0.16", path = "../metrics-util", default-features = false, features = ["recency", "registry", "summary"] }
 thiserror = { version = "1", default-features = false }
 quanta = { version = "0.12", default-features = false }
-indexmap = { version = "1", default-features = false }
+indexmap = { version = "2.1", default-features = false, features = ["std"] }
 base64 = { version = "0.21.0", default-features = false, features = ["std"] }
 
 # Optional

metrics-util/Cargo.toml

@@ -51,7 +51,7 @@ metrics = { version = "^0.22", path = "../metrics" }
 crossbeam-epoch = { version = "0.9.2", default-features = false, optional = true, features = ["alloc", "std"] }
 crossbeam-utils = { version = "0.8", default-features = false, optional = true }
 aho-corasick = { version = "1", default-features = false, optional = true, features = ["std"] }
-indexmap = { version = "1", default-features = false, optional = true }
+indexmap = { version = "2.1", default-features = false, features = ["std"], optional = true }
 quanta = { version = "0.12", default-features = false, optional = true }
 sketches-ddsketch = { version = "0.2", default-features = false, optional = true }
 radix_trie = { version = "0.2", default-features = false, optional = true }